W>The GetModuleFileName function retrieves the full path and file name for the file containing the specified module.


а отрезать лишнее можно так

char path_buf[_MAX_PATH];
char drive[_MAX_DRIVE];
char dir[_MAX_DIR];

::GetModuleFileName(NULL,path_buf,sizeof(path_buf)-1);
_splitpath(path_buf,drive,dir,0,0);
_makepath(path_buf,drive,dir,0,0);